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What can cause the 4-20mA signal to latch on the ATV61 or Eflex drives?

Issue:
What can cause the 4-20mA signal to latch on the ATV61 or Eflex drives?

Product Line:
Altivar ATV61 Eflex

Environment:
All

Cause:
Noise issues

Resolution:
His circuit has noise exceeding 7.9 V on this input and so it is latching at 20 mA.
They can go to Radio Shack or other electronics vendor and buy two 6.8 V zener diodes, one for each drive. Put the cathode end, marked with a line, on the AI2 input, and the other end on the COM terminal.   This will prevent the latch up.
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